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strace(8)							     strace(8)

NAME
       strace - Writes STREAMS event trace messages to standard output

SYNOPSIS
       /usr/sbin/strace [mod_ID sub_ID pri_level]

OPERANDS
       Specifies  the  STREAMS	module	identification	number.	  Specifies  a
       subidentification number	 (often	 corresponding	to  a  minor  device).
       Specifies  a  tracing priority level.  The strace command will get mes‐
       sages of a level equal to or less than the value in the pri_level argu‐
       ment. The value of the argument must be a nonnegative integer.

DESCRIPTION
       The strace command gets STREAMS event trace messages from STREAMS driv‐
       ers and modules via the STREAMS log driver (strlog), and	 writes	 these
       messages to standard output. You can limit the messages strace receives
       by specifying arguments to the command.	All  three  operands  must  be
       specified together.

       You can specify all as the value for any of the arguments in the strace
       command line. The value all indicates that there	 are  no  restrictions
       for that argument.

       You  can also specify multiple sets of the command's three arguments to
       obtain the messages from more than one driver or module.

       More than one strace process can open the STREAMS log driver at a time.
       When  you  invoke strace, the log driver compares the sets of arguments
       from the command line with actual trace messages,  returning  the  mes‐
       sages that satisfy the criteria.

       STREAMS event trace messages have the following format: seqnum  stdtime
       tickstime  pri_level  ntfycode  mod_ID  sub_ID  msgtext

       The event trace sequence number.	 The time the message was sent, in the
       format  hh:mm:ss.   The	time the message was sent, measured in machine
       ticks since the last boot.  The tracing priority level  as  defined  by
       the  STREAMS  driver  or	 module	 that originates the messages.	Can be
       either of the following indicators: Indicates that the message has also
       been  saved  in	the  error log.	 Indicates that the message signaled a
       fatal error.  The module identification number  of  the	trace  message
       source.	The subidentification number of the trace message source.  The
       trace message text.

       The strace command runs until terminated by the user.

RESTRICTIONS
       Running strace with several sets of  arguments  can  negatively	affect
       STREAMS performance, particularly for those modules and drivers sending
       the messages.

       Also be aware that strace may not be able to handle a large  number  of
       messages.   If  drivers	and  modules  return  messages	to  strace too
       quickly, some may be lost.

EXAMPLES
       To display all trace messages received from the driver or module	 iden‐
       tified  by mod_ID 28, enter: % strace 28 all all To display those trace
       messages from the driver or module identified  by  mod_ID  28  and  its
       minor  devices  identified  by the sub_IDs 2, 3, and 4, enter: % strace
       28 2 all	 28 3 all  28 4 all

	      This command line causes messages of any tracing priority	 level
	      to  be  displayed.   To display the trace messages from the same
	      driver or module and sub_IDs, but limited	 to  certain  priority
	      levels, enter: % strace  28 2 0  28 3 0  28 4 1

	      This  command line specifies that messages from driver or module
	      28 and sub_IDs 2 and 3 must have a tracing priority  of  0,  and
	      those  from  sub_ID  4  must have a tracing priority equal to or
	      less than 1.

SEE ALSO
       Commands: strclean(8), strerr(8)

       Interfaces: strlog(7)

								     strace(8)
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